Physics
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsm14b..04l&link_type=abstract
American Geophysical Union, Fall Meeting 2010, abstract #SM14B-04
Physics
[2716] Magnetospheric Physics / Energetic Particles: Precipitating, [2730] Magnetospheric Physics / Magnetosphere: Inner, [2772] Magnetospheric Physics / Plasma Waves And Instabilities, [2774] Magnetospheric Physics / Radiation Belts
Scientific paper
The modulation of whistler-mode chorus waves is an interesting phenomenon essential for understanding the driving mechanism of pulsating aurora and other related processes. Using observations from THEMIS, we investigated variations of the ambient magnetic field, energetic electron distribution and total plasma density during chorus intensity modulation to determine dominant factors controlling the modulation of the chorus wave amplitude. We show that compressional Pc5 pulsations, commonly observed at large L-shells of 8-12, can modulate whistler-mode waves by modulating the minimum resonant energy of electrons and resonant electron fluxes on a time scale from tens of seconds to a few minutes. We also found that density variations occurring in the dominant chorus source region play an important role in modulating chorus wave intensity and generated wave frequency spectrum. The one-to-one correlation between dips in total plasma density and increases in chorus wave power is observed on a short time scale from <1 to tens of seconds. Thus, this may explain the modulation of pulsating aurora intensity by the modulation of precipitating electron fluxes through interaction with modulated chorus waves. We suggest that density depletions may drive the chorus wave intensity to the observable levels and thus result in whistler-mode chorus modulation.
Angelopoulos Vassilis
Bortnik Jacob
Chen Leon L.
Li Wangrong
Mansergh Thorne Richard
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